The Frontline documentary The Choice, which premiered this week on PBS, reveals that Trump agrees with the dangerous and abusive theory of eugenics.

Trump’s father instilled in him the idea that their family’s success was genetic, according to Trump biographer Michael D’Antonio.

“The family subscribes to a racehorse theory of human development,” D’Antonio says in the documentary. “They believe that there are superior people and that if you put together the genes of a superior woman and a superior man, you get a superior offspring.”

The Huffington Post pulled together video clips of Donald Trump referencing his superior eugenics theory and it is nothing short of horrifying. Watch and then jump below for further information on the origins of the racist eugenics theory: